A backfire-proof venting silencer

Abstract

The present invention discloses an anti-backfire venting silencer, comprising a cylinder, a silencer structure, an anti-backfire structure and a fire extinguishing structure; the cylinder is provided with a silencer structure, an anti-backfire structure and a fire extinguishing structure from bottom to top. The silencer structure is used to reduce the noise during gas venting, the anti-backfire structure is used to prevent and block the backfire that occurs during gas discharge, and the fire extinguishing structure is used to dynamically isolate the air and can quickly cool down and extinguish the fire when a backfire accident occurs. The anti-backfire venting silencer of the present invention has a perfect anti-backfire function while efficiently reducing the noise of gas venting. The flame formed by the backfire is divided and energy is absorbed by the clustered metal thin-walled tubes. A unique method of injecting nitrogen into the silencer is adopted to achieve dynamic isolation of the air that may enter the cylinder and rapid cooling and fire extinguishing when a backfire accident occurs, which fundamentally eliminates the occurrence of backfire accidents, avoids safety accidents such as fire and explosion, and ensures the safe production of the discharge device.

Description

Technical Field

[0001] The invention belongs to the technical field of muffler equipment, and in particular relates to an anti-backfire venting muffler. Background Art

[0002] The vent silencer is a noise suppression product designed and developed to suppress the noise generated when factory pipes are vented and exhausted. In the modern industrial production process, vent silencers, as an important noise control equipment, have been widely used in power generation, chemical industry, metallurgy, textile and other fields. This type of equipment effectively reduces the aerodynamic noise generated when the gas is vented through its carefully designed internal acoustic treatment facilities, significantly reduces the noise pollution to the environment, and meets the increasingly stringent environmental protection control requirements. Especially in the chemical industry, the role of vent silencers is particularly prominent. Since chemical production often involves the emission of flammable gases, such as in the conditions of start-up and shutdown, accidental emissions, etc., these gases often need to be safely discharged through vent silencers.

[0003] However, in the process of vent silencer design, there is a technical problem that needs to be solved urgently. In order to reduce noise more effectively, the design of vent silencers often keeps the discharge flow rate of the gas at the cylinder outlet at a low level. Especially at the end of the discharge, the gas flow rate will even be lower than the flashback speed of the discharged gas. Although this design strategy has achieved remarkable results in reducing noise propagation, it has also caused safety hazards to a certain extent. When the flow rate of the combustible gas at the outlet of the vent silencer is lower than the flashback speed, once it encounters external excitation factors such as lightning strikes, open flames, and static electricity, the combustible gas discharged into the atmosphere is at risk of being ignited. Due to the complexity of the internal structure of the vent silencer, once a flame is formed at the outlet, the flame may quickly flow upstream through the channel inside the silencer and return to the upstream system. This situation may not only cause serious damage to the equipment, but may also cause safety accidents such as fires and explosions, causing immeasurable economic losses and casualties. In recent years, there have been many safety accidents in China caused by improper design of vent silencers or inadequate safety measures. These accidents have not only brought heavy economic burdens to related companies, but also posed a great threat to the life safety and physical health of employees.

[0004] Therefore, designing a venting silencer that can both efficiently suppress noise and ensure safety and reliability is of great significance for ensuring the safety and stability of industrial production, protecting the lives and property of employees, and meeting increasingly stringent environmental protection requirements. Summary of the invention

[0005] The purpose of the present invention is to provide an anti-backfire venting silencer to address the above shortcomings. By setting a silencer structure and an anti-backfire structure, it can not only reduce the noise during gas venting but also have the function of anti-backfire, thus avoiding safety accidents such as fire and explosion, and ensuring the safety and stability of industrial production. To achieve the above purpose, the present invention provides the following technical solutions:

[0006] A backfire prevention venting silencer comprises a cylinder, a silencer structure and an anti-backfire structure; the cylinder is provided with the silencer structure and the anti-backfire structure; the silencer structure is located below the anti-backfire structure, and an air inlet pipe opening of the silencer structure is connected to an external device through the bottom of the cylinder; exhaust gas enters the silencer structure from the air inlet pipe opening for pressure reduction and noise reduction, and is then discharged through the anti-backfire structure, and the anti-backfire structure is used to prevent and block backfire occurring during gas discharge.

[0007] Furthermore, the anti-backfire structure includes a plurality of first thin-walled tubes; the first thin-walled tubes are arranged above the silencer structure in the cylinder and along the gas flow direction.

[0008] Furthermore, the anti-backfire structure also includes a plurality of second thin-walled tubes; the second thin-walled tubes are arranged between the first thin-walled tubes and the inner wall of the cylinder to fill the gap between the first thin-walled tubes and the inner wall of the cylinder.

[0009] Furthermore, it also includes a fire extinguishing structure; the fire extinguishing structure includes a nitrogen pipeline; a nitrogen pipeline is provided on the cylinder; one end of the nitrogen pipeline enters the cylinder and is located between the silencer structure and the anti-backfire structure, and the other end is located outside the cylinder and connected to an external nitrogen supply pipeline device; a gas nozzle is provided on the part of the nitrogen pipeline located inside the cylinder.

[0010] Furthermore, the fire extinguishing structure also includes an interlock switch valve and a temperature sensor; an interlock switch valve is provided on the part of the nitrogen pipeline located on the cylinder; a temperature sensor is provided on the anti-flashback structure; the temperature sensor is a single-branch multi-point thermal resistor temperature transmitter, one end of which is inserted into the anti-flashback structure to measure the temperature of the first thin-walled tube and the second thin-walled tube in the anti-flashback structure, and transmit the high temperature signal to the controller, and the controller controls the opening and closing of the interlock switch valve according to the interlock signal.

[0011] Furthermore, a bypass pipeline is provided at the interlock switch valve on the nitrogen pipeline; two ends of the bypass pipeline are respectively located at two ends of the interlock switch valve and connected to the nitrogen pipeline; a flow limiting orifice is provided on the bypass pipeline.

[0012] Furthermore, the silencing structure is a small hole injection type or a through hole diffusion type silencing inner cylinder.

[0013] Furthermore, an antistatic fire-resistant sound-absorbing layer is provided on the inner wall of the cylinder.

[0014] Furthermore, a drain port is provided at the bottom of the cylinder.

[0015] Furthermore, a protective net is provided on the top of the cylinder.

[0016] The beneficial effects of the present invention are:

[0017] The present invention discloses an anti-backfire venting silencer, comprising a cylinder, a silencer structure, an anti-backfire structure and a fire extinguishing structure; the cylinder is provided with a silencer structure, an anti-backfire structure and a fire extinguishing structure from bottom to top. The silencer structure is used to reduce the noise during gas venting, the anti-backfire structure is used to prevent and block the backfire that occurs during gas discharge, and the fire extinguishing structure is used to dynamically isolate the air while being able to quickly cool down and extinguish the fire when a backfire accident occurs. The anti-backfire venting silencer of the present invention has a perfect anti-backfire function while efficiently reducing the noise of gas venting. The flame formed by the backfire is divided and energy is absorbed through a clustered metal thin-walled tube of a specific specification. A unique method of injecting nitrogen into the silencer is adopted to achieve dynamic isolation of the air that may enter the cylinder and rapid cooling and fire extinguishing when a backfire accident occurs, thereby fundamentally eliminating the occurrence of backfire accidents, avoiding the occurrence of safety accidents such as fire and explosion, and ensuring the safe production of the discharge device. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the structure of the venting silencer of the present invention;

[0019] Figure 2 is a cross-sectional view of the anti-backfire structure of the present invention;

[0020] In the accompanying drawings: 1-cylinder, 2-silencing structure, 3-anti-backfire structure, 31-first thin-walled tube, 32-second thin-walled tube, 4-nitrogen pipeline, 5-gas nozzle, 6-interlock switch valve, 7-temperature sensor, 8-bypass pipeline, 9-flow limiting orifice, 10-antistatic fire-resistant sound-absorbing layer, 11-drain port, 12-fire extinguishing structure. DETAILED DESCRIPTION

[0021] The exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. Although the exemplary embodiments of the present disclosure are shown in the accompanying drawings, it should be understood that the present disclosure can be implemented in various forms and should not be limited by the embodiments set forth herein. On the contrary, these embodiments are provided in order to enable a more thorough understanding of the present disclosure and to fully convey the scope of the present disclosure to those skilled in the art.

[0022] It should be understood that the terms used herein are only for the purpose of describing specific example embodiments and are not intended to be limiting. Unless the context clearly indicates otherwise, the singular forms "one", "an" and "said" as used herein may also be meant to include plural forms. The terms "include", "comprise", "contain", and "have" are inclusive and therefore specify the existence of stated features, steps, operations, elements and / or parts, but do not exclude the existence or addition of one or more other features, steps, operations, elements, parts and / or combinations thereof. The method steps, processes, and operations described herein are not interpreted as necessarily requiring them to be performed in the specific order described or illustrated, unless the execution order is clearly indicated. It should also be understood that additional or alternative steps may be used.

[0023] Although the terms first, second, third, etc. can be used in the text to describe multiple elements, components, regions, layers and / or sections, these elements, components, regions, layers and / or sections should not be limited by these terms. These terms can only be used to distinguish an element, component, region, layer or section from another region, layer or section. Unless the context clearly indicates, terms such as "first", "second" and other numerical terms do not imply order or sequence when used in the text. Therefore, the first element, component, region, layer or section discussed below can be referred to as the second element, component, region, layer or section without departing from the teaching of the example embodiments.

[0024] For ease of description, spatial relative terms may be used in the text to describe the relationship of one element or feature relative to another element or feature as shown in the figure, such as "inside", "outside", "inner side", "outer side", "below", "below", "above", "above", etc. Such spatial relative terms include different orientations of the device in use or operation in addition to the orientation depicted in the figure. For example, if the device in the figure is turned over, the element described as "below other elements or features" or "below other elements or features" will then be oriented as "above other elements or features" or "above other elements or features". Therefore, the example term "below..." can include both upper and lower orientations. The device can be oriented otherwise (rotated 90 degrees or in other directions) and the spatial relative descriptors used in the text are interpreted accordingly.

[0025] Embodiment 1

[0026] See attached Figures 1-2. The present invention discloses an anti-backfire venting silencer including a cylinder 1, a silencer structure 2 and an anti-backfire structure 3, wherein the cylinder 1 can be designed to be cylindrical, and the design pressure can withstand the impact force generated by the exhaust gas under the deflagration condition. The silencer structure 2 and the anti-backfire structure 3 are arranged in the cylinder 1, and the silencer structure 2 is located below the anti-backfire structure 3. The air inlet port of the silencer structure 2 is connected to the external equipment through the bottom of the cylinder 1. The factory pipeline is vented and the gas enters the silencer structure 2 from the air inlet port of the silencer structure 2 to reduce or eliminate the noise generated when the gas flows, and then passes through the anti-backfire structure 3 above and is discharged into the atmosphere. The anti-backfire structure 3 is used to prevent and block the backfire that occurs when the gas is discharged. Among them, the silencer structure 2 is a small hole injection type or a through hole diffusion type silencer inner cylinder, which uses the principle of multi-stage throttling and pressure reduction or material sound absorption to reduce and attenuate the exhaust pressure and pressure pulsation by consuming the exhaust energy, so that the exhaust noise is reduced. The anti-backfire venting silencer of the present invention can not only reduce the noise during gas venting but also has the function of anti-backfire, thus avoiding safety accidents such as fire and explosion, and ensuring the safety and stability of industrial production.

[0027] Specifically, the anti-flashback structure 3 adopts a structure of a clustered filling tube, including a plurality of first thin-walled tubes 31 and a second thin-walled tube 32. Among them, it is mainly composed of the first thin-walled tube 31, which can be a stainless steel seamless thin-walled tube with a specification of Φ12mm×0.5mm. A plurality of first thin-walled tubes 31 are bundled by spot welding between adjacent pipes, and then arranged on the inner wall of the cylinder 1 along the gas flow direction, and welded and fixed at the place in contact with the inner wall of the cylinder 1. The gap between the first thin-walled tubes 31 and the inner wall of the cylinder 1 is filled with the second thin-walled tube 32, which can be a stainless steel seamless thin-walled tube with a specification of Φ6mm×0.5mm. When flashback occurs, the flame formed by the flashback is divided by the first thin-walled tube 31 and the second thin-walled tube 32 with good heat conduction performance, the heat is absorbed, and the temperature and energy are continuously reduced, and finally extinguished, which effectively inhibits the flashback flame from spreading to the equipment connected thereto, thereby protecting the safe operation of the combustion equipment. The lengths of the first thin-walled tube 31 and the second thin-walled tube 32 can be determined according to the combustion calorific value of different gases, and are usually not more than 2 meters. The clustered filling tube form of the anti-flashback structure 3 of the present invention fully guarantees the flow area of ​​the gas while ensuring the fire-retardant effect, and avoids blockage and increased discharge back pressure to the greatest extent. At the same time, the clustered filling tube form of the anti-flashback structure 3 can also adjust the flow pattern of the exhaust gas, further reduce the energy of the exhaust gas, and reduce the noise of the exhaust gas.

[0028] Specifically, the anti-flashback venting silencer of the present invention further includes a fire extinguishing structure 12, and the fire extinguishing structure 12 includes a nitrogen pipeline 4. A nitrogen pipeline 4 is provided on the cylinder 1, one end of the nitrogen pipeline 4 enters the cylinder 1, and is located between the silencer structure 2 and the anti-flashback structure 3, and the other end is located outside the cylinder 1 and connected to an external nitrogen supply device. The nitrogen pipeline 4 adopts a pipeline with a specification of DN100, and a portion of the nitrogen pipeline 4 located inside the cylinder 1 is provided with a plurality of gas nozzles 5. When flashback occurs, nitrogen can be simultaneously input into the cylinder 1 through the nitrogen pipeline 4 to cool down and extinguish the fire, completely eliminating the risk of flashback.

[0029] Specifically, the fire extinguishing structure 12 also includes an interlock switch valve 6 and a temperature sensor 7. An interlock switch valve 6 is provided on the portion of the nitrogen pipeline 4 located at the cylinder 1 to control the input of nitrogen into the cylinder 1. A temperature sensor 7 is provided on the anti-flashback structure 3. The single-branch multi-point thermal resistor temperature transmitter is a high-precision, multi-point measurement temperature measuring device. One end is inserted into the first thin-walled tube 31 and the second thin-walled tube 32 in the anti-flashback structure 3 to measure the tube wall temperature of the first thin-walled tube 31 and the second thin-walled tube 32, and transmit the information to the controller. The controller controls the opening and closing of the interlock switch valve 6 according to the temperature signal value. When flashback occurs, the wall temperature of the first thin-walled tube 31 and the second thin-walled tube 32 will rise due to the absorption of flame energy. When the temperature rises to a specific interlock value, the controller is triggered to open the interlock switch valve 6, and nitrogen is injected into the cylinder 1 through the nitrogen pipeline 4 from the gas nozzle 5 to cool down and extinguish the fire. The interlock switch valve 6 and the temperature sensor 7 of the fire extinguishing structure 12 realize automatic and rapid fire extinguishing in the event of a flashback accident.

[0030] Specifically, a bypass pipeline 8 is provided at the interlock switch valve 6 on the nitrogen pipeline 4, and the two ends of the bypass pipeline 8 are respectively connected to the two ends of the interlock switch valve 6 and the nitrogen pipeline 4. The bypass pipeline 8 adopts a pipeline with a specification of DN20, and a flow limiting orifice plate 9 with an aperture of 5 mm is also provided on the bypass pipeline 8. When no flashback occurs, the interlock switch valve 6 is closed, and the external nitrogen enters the cylinder 1 through the DN20 bypass pipeline 8 in a state of continuous small flow to continuously replace the combustible gas in the cylinder, and at the same time forms a nitrogen dynamic seal to avoid the "chimney effect" causing air to enter the cylinder 1 and form a mixed explosive gas with the discharged combustible gas. The fire extinguishing structure 12 of the present invention inputs nitrogen into the cylinder 1 through the nitrogen pipeline 4, the interlock switch valve 6, the temperature sensor 7 and the bypass pipeline 8, which can not only realize automatic rapid cooling and fire extinguishing when flashback occurs, but also form nitrogen dynamic isolation under normal circumstances, completely eliminating the risk of flashback.

[0031] Specifically, an anti-static fire-resistant sound-absorbing layer 10 is provided on the inner wall of the cylinder corresponding to the silencer structure 2 to absorb sound energy and reduce noise together with the silencer structure 2, and at the same time, it can also prevent static electricity generated by friction caused by high-speed gas impacting the inner wall of the cylinder. A drain port 11 is provided at the bottom of the cylinder, and the drain port 11 is used to discharge liquid accumulated in the cylinder due to rain or condensation of the discharge medium. A protective net is also provided on the top of the cylinder, and the protective net is used to prevent birds from making nests or other large objects or animals from entering the cylinder to affect the operation of the silencer.

[0032] All technical features in this embodiment can be freely combined according to actual needs. The above embodiments are only used to illustrate the technical solution of the present invention rather than to limit it. Although the present invention is described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that the technical solution of the present invention can be modified or replaced by equivalents without departing from the purpose and scope of the technical solution of the present invention, which should be covered by the scope of the claims of the present invention. The technology, shape, and structural parts not described in detail in the present invention are all well-known technologies.

[0033] The above embodiments are preferred implementation schemes of the present invention. In addition, other implementation schemes are also included. Any obvious replacement without departing from the concept of the present technical scheme is within the protection scope of the present invention.

Claims

1. An anti-backfire venting muffler, characterized in that: It comprises a cylinder (1), a silencer structure (2), and an anti-flashback structure (3); the silencer structure (2) and the anti-flashback structure (3) are arranged inside the cylinder (1); the silencer structure (2) is located below the anti-flashback structure (3), and the air inlet of the silencer structure (2) is connected to external equipment through the bottom of the cylinder (1); The exhaust gas enters the silencer structure (2) from the air inlet port to reduce pressure and noise, and then is discharged through the anti-backfire structure (3). The anti-backfire structure (3) is used to prevent and block backfire that occurs when the gas is discharged.

2. The anti-backfire venting silencer according to claim 1, characterized in that: The anti-flashback structure (3) comprises a plurality of first thin-walled tubes (31); the first thin-walled tubes (31) are arranged above the silencer structure (2) in the cylinder (1) and are arranged along the gas flow direction.

3. The anti-backfire venting silencer according to claim 2, characterized in that: The anti-backfire structure (3) further comprises a plurality of second thin-walled tubes (32); the second thin-walled tubes (32) are arranged between the first thin-walled tube (31) and the inner wall of the cylinder (1) to fill the gap between the first thin-walled tube (31) and the inner wall of the cylinder (1).

4. The anti-backfire venting silencer according to claim 1, characterized in that: It also includes a fire extinguishing structure (12); the fire extinguishing structure (12) includes a nitrogen pipeline (4); the cylinder (1) is provided with a nitrogen pipeline (4); one end of the nitrogen pipeline (4) enters the cylinder (1) and is located between the silencer structure (2) and the anti-flashback structure (3), and the other end is located outside the cylinder (1) and connected to a pipeline for supplying nitrogen from the outside; a gas nozzle (5) is provided on the part of the nitrogen pipeline (4) located inside the cylinder (1).

5. The anti-backfire venting silencer according to claim 4, characterized in that: The fire extinguishing structure (12) further comprises an interlocking switch valve (6) and a temperature sensor (7); the interlocking switch valve (6) is provided on the part of the nitrogen pipeline (4) located on the cylinder (1); the temperature sensor (7) is provided on the anti-flashback structure (3); the temperature sensor (7) is a single-branch multi-point thermal resistance temperature transmitter, one end of which is inserted into the anti-flashback structure (3), measures the temperature of the first thin-walled tube and the second thin-walled tube in the anti-flashback structure (3), and transmits a high temperature signal to the controller, and the controller controls the opening and closing of the interlocking switch valve (6) according to the interlocking signal.

6. The anti-backfire venting silencer according to claim 5, characterized in that: A bypass pipeline (8) is provided at the interlock switch valve (6) on the nitrogen pipeline (4); two ends of the bypass pipeline (8) are respectively located at two ends of the interlock switch valve (6) and are connected to the nitrogen pipeline (4); a flow limiting orifice plate (9) is provided on the bypass pipeline (8).

7. The anti-backfire venting silencer according to claim 1, characterized in that: The silencer structure (2) is a small hole injection type or a through hole diffusion type silencer inner cylinder.

8. The anti-backfire venting silencer according to claim 1, characterized in that: An antistatic, fire-resistant and sound-absorbing layer (10) is provided on the inner wall of the cylinder (1).

9. The anti-backfire venting silencer according to claim 1, characterized in that: The bottom of the cylinder (1) is provided with a drain port (11).

10. The anti-backfire venting silencer according to claim 1, characterized in that: A protective net is provided on the top of the cylinder (1).

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